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Posted to dev@lucene.apache.org by "Amrit Sarkar (JIRA)" <ji...@apache.org> on 2019/02/06 11:34:00 UTC
[jira] [Updated] (SOLR-13226) Add note for Node Added Trigger
documentation in Autoscaling
[ https://issues.apache.org/jira/browse/SOLR-13226?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Amrit Sarkar updated SOLR-13226:
--------------------------------
Summary: Add note for Node Added Trigger documentation in Autoscaling (was: Add note in Node Added Trigger documentation in Autoscaling)
> Add note for Node Added Trigger documentation in Autoscaling
> ------------------------------------------------------------
>
> Key: SOLR-13226
> URL: https://issues.apache.org/jira/browse/SOLR-13226
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: AutoScaling
> Reporter: Amrit Sarkar
> Priority: Major
> Attachments: Screen Shot 2019-02-05 at 3.55.31 AM.png, Screen Shot 2019-02-05 at 4.02.00 AM.png
>
>
> Node Added Trigger doesn't abide by SOFT rules [strict: false] and results in abnormal cluster operational behavior.
> Let's say; we wish to do the following:
> 1. Not more than 10 cores reside on Single node.
> 2. Wish to distribute the cores, replicas equally to each Node.
> If we go by the following policy:
> not more than one replica for unique shard on a node. not a strict rule.
> {code}
> {"replica":"<2", "shard": "#EACH", "node": "#ANY", "strict": false},
> {code}
> distribute the replicas equally across the nodes, not a strict rule.
> {code}
> {"replica": "#EQUAL", "node": "#ANY", "strict": false},
> {code}
> not more than 10 cores allowed on a single node, strict rule.
> {code}
> {"cores": "<10", "node": "#ANY"}
> {code}
> cluster state ends up like:
> Screenshot -1
> Only the strict rule is followed and multiple replicas are added to single Solr node, as rules are not strict – _{"replica":"<2", "shard": "#EACH", "node": "#ANY", "strict": false}_
> While the following with all strict rule generate normal operational behavior, add a replica to each shard of collection 'wiki' :
> {code}
> [
> {"replica":"<2", "shard": "#EACH", "node": "#ANY"},
> {"replica": "#EQUAL", "node": "#ANY"},
> {"cores": "<10", "node": "#ANY"}
> ]
> {code}
> Screenshot -2
> This behavior should be documented.
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